摘要
TD-LTE系统中循环前缀(CP)有防止符号间干扰的作用,接收端只有确定CP类型才能确定准确的FFT解调窗口位置。本文提出了基于CP的相关算法和能量差算法,主要利用CP为该符号尾端数据的复制这一特性,通过不同CP长度间相关系数比值和能量差值系数比值来估计CP类型。同时考虑到算法的复杂度和DSP实现的简易程度,进一步改进了以上算法,提出了基于部分序列的相关能量差算法,仿真结果和算法原理表明了该算法的实用性和低复杂度等优点。
Cyclic prefix（CP） is very important to prevent inter-symbol interference in TD-LTE systems, the receiver must calculate the type of CP in order to obtain the right FFT decode window. Base on the CP＇s character, copying fixing length data from end of the symbol sequence, presents two algorithms,sequence correlation and energy difference, which can confirm the type through correlation degree and energy difference between different sequence lengths. Finally, considering algorithm complexity and DSP realization, improve on energy difference algorithm, using part sequence instead of whole sequence. Simulation result and algorithm theory show the effectiveness and low complexity.
出处
《电信科学》
北大核心
2012年第5期104-108,共5页
Telecommunications Science
基金
国家科技重大专项项目"TD-LTE射频一致性测试仪表"(No.2011ZX03001-002)
关键词
TD-LTE
CP
能量差
相关
TD-LTE, cyclic prefix, energy difference, correlation
